sotron1.cpp: In function 'int main()': sotron1.cpp:85: warning: unused variable 'i' sotron1.cpp:85: warning: unused variable 'x1' sotron1.cpp:83: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result sotron1.cpp:84: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result sotron1.cpp:86: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result sotron1.cpp:91: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result sotron1.cpp: In function 'int get_direction(int, int)': sotron1.cpp:41: warning: control reaches end of non-void function sotron1.cpp: In function 'int main()': sotron1.cpp:85: warning: 'xi' may be used uninitialized in this function sotron1.cpp:85: warning: 'yi' may be used uninitialized in this function sotron1.cpp:85: warning: 'xf' may be used uninitialized in this function sotron1.cpp:85: warning: 'yf' may be used uninitialized in this function